There are currently two different obtainable types of currency in Super Golf - Coins and Gems. Both of which are obtained from completing levels.
During the 2020 Christmas event, a new currency in the form of Candies were added and would be gone on the 29th of January 2021. Candies were used to buy limited-edition collectibles and could be earned also by completing levels.
Coins are a more common currency. Coins are mainly earned through completing holes, but they can also be obtained through codes and Robux purchases. The less strokes used to complete a hole, the more coins you'll earn. Coins earnings through hole completions can be doubled by purchasing the 2x Coins and XP Gamepass.
Gems are a rarer form of currency. Gems can be obtained through scoring below par with the Gem Rewards gamepass, redeeming codes, or by purchasing them with Robux. Gems scale with your score below par.
In Pro Servers, Coin earnings are increased, although you have to be at least level 25 to enter one.
You can spend the Coins and Gems you've obtained in the Shop for skins, hats, and more.